Solve the system of equations using matrices.4x - 15y = -8-16x + 9y = -2
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Find the area of the specified region.Inside one leaf of the four-leaved rose r = 5 sin 2?
A. 
B. 
C. 
- 
D. 
Mathematics
Match the surface show below to the graph of its level curves.
A. 
B. 
C. 
D. 
Mathematics
Evaluate. The differential is exact.
A. 3
B. 0
C. 
D. 1
Mathematics
Solve the problem.A chemist needs to mix a 20% acid solution with a 70% acid solution to obtain 8 liters of a 50% acid solution. How many liters of each of the solutions must be used?
A. 1.6 L of the 20% solution; 6.4 L of the 70% solution B. 2.4 L of the 20% solution; 5.6 L of the 70% solution C. 4 L of the 20% solution; 4 L of the 70% solution D. 3.2 L of the 20% solution; 4.8 L of the 70% solution
Mathematics